still not a very clear picture but it's hard to get pics of a 'moving target'. It looks lile a) feather picking or b) some wound/injury from possibly some wire fencing or some critter that got claw in???? Either way, I would try to wash it out a bit, try to get a better look ( does it look like a puncture wound or a tear in the skin, deep etc.) You can apply some antibiotic ointment a couple of times a day until its healed. Keep an eye on it or signs of infection. Either way, seperate the chicken until it is healed, maybe fence a part of the coop off with something or keep it in a dog crate. You don't want to others to start picking on the wound. If you think it is feather picking by other chickens you may have to adress that (check threads for feather picking - causes and how to 'fix it') Good luck!!!!
